A high yield procedure for the preparation of arsonolipids (2,3-diacyloxypropylarsonic acids)
作者:Panayiotis V. Ioannou、Gerasimos M. Tsivgoulis
DOI:10.1016/j.chemphyslip.2009.10.008
日期:2010.1
temperature and rate of the acyl chloride addition, giving ∼70% yields of arsonolipids. The presence of catalytic amounts of 4-dimethylaminopyridine boosted the yields to 82–85%. This yield is a great improvement over the yields (20–55%) previously achieved. The acylating systems (RCO)2O or RCOCl and BF3·Et2O gave only moderate yields (25–60%) of arsonolipids.
从二氯甲烷中可溶的二硫代亚砷酸盐CH 2(OH)CH(OH)CH 2 -As(SPh)2开始制备标题arsonolipids的关键步骤是避免在酰化过程中发生内部环化反应,从而保护伯-OH基团从被酰化。这在很大程度上是通过在弱碱吡啶存在下使用脂肪酰氯并控制温度和酰氯的添加速率来实现的,从而获得了约70%的Arsonolipids。催化量的4-二甲基氨基吡啶的存在将产率提高到82-85%。与以前的产量(20-55%)相比,该产量有了很大的提高。酰化系统(RCO)2 O或RCOCl和BF 3 ·Et 2O仅给出中等量的砷脂(25-60%)。